1 /*-
2 * Copyright (c) 2018, Juniper Networks, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #define NEED_BRSSL_H
30 #include <libsecureboot.h>
31 #include <brssl.h>
32
33 #include "decode.h"
34
35 /**
36 * @brief decode ascii armor
37 *
38 * once we get rid of the trailing checksum
39 * we can treat as PEM.
40 *
41 * @sa rfc4880:6.2
42 */
43 unsigned char *
dearmor(char * pem,size_t nbytes,size_t * len)44 dearmor(char *pem, size_t nbytes, size_t *len)
45 {
46 #ifdef USE_BEARSSL
47 pem_object *po;
48 size_t npo;
49 #else
50 BIO *bp;
51 char *name = NULL;
52 char *header = NULL;
53 #endif
54 unsigned char *data = NULL;
55 char *cp;
56 char *ep;
57
58 /* we need to remove the Armor tail */
59 if ((cp = strstr((char *)pem, "\n=")) &&
60 (ep = strstr(cp, "\n---"))) {
61 memmove(cp, ep, nbytes - (size_t)(ep - pem));
62 nbytes -= (size_t)(ep - cp);
63 pem[nbytes] = '\0';
64 }
65 #ifdef USE_BEARSSL
66 /* we also need to remove any headers */
67 if ((cp = strstr((char *)pem, "---\n")) &&
68 (ep = strstr(cp, "\n\n"))) {
69 cp += 4;
70 ep += 2;
71 memmove(cp, ep, nbytes - (size_t)(ep - pem));
72 nbytes -= (size_t)(ep - cp);
73 pem[nbytes] = '\0';
74 }
75 if ((po = decode_pem(pem, nbytes, &npo))) {
76 data = po->data;
77 *len = po->data_len;
78 }
79 #else
80 if ((bp = BIO_new_mem_buf(pem, (int)nbytes))) {
81 long llen = (long)nbytes;
82
83 if (!PEM_read_bio(bp, &name, &header, &data, &llen))
84 data = NULL;
85 BIO_free(bp);
86 *len = (size_t)llen;
87 }
88 #endif
89 return (data);
90 }
91
92 #ifdef MAIN_DEARMOR
93 #include <unistd.h>
94 #include <fcntl.h>
95 #include <err.h>
96
97 /*
98 * Mostly a unit test.
99 */
100 int
main(int argc,char * argv[])101 main(int argc, char *argv[])
102 {
103 const char *infile, *outfile;
104 unsigned char *data;
105 size_t n, x;
106 int fd;
107 int o;
108
109 infile = outfile = NULL;
110 while ((o = getopt(argc, argv, "i:o:")) != -1) {
111 switch (o) {
112 case 'i':
113 infile = optarg;
114 break;
115 case 'o':
116 outfile = optarg;
117 break;
118 default:
119 errx(1, "unknown option: -%c", o);
120 }
121 }
122 if (!infile)
123 errx(1, "need -i infile");
124 if (outfile) {
125 if ((fd = open(outfile, O_WRONLY|O_CREAT|O_TRUNC)) < 0)
126 err(1, "cannot open %s", outfile);
127 } else {
128 fd = 1; /* stdout */
129 }
130 data = read_file(infile, &n);
131 if (!(data[0] & OPENPGP_TAG_ISTAG))
132 data = dearmor(data, n, &n);
133 for (x = 0; x < n; ) {
134 o = write(fd, &data[x], (n - x));
135 if (o < 0)
136 err(1, "cannot write");
137 x += o;
138 }
139 if (fd != 1)
140 close(fd);
141 free(data);
142 return (0);
143 }
144 #endif
145